From the lowest amoeba to the highest angel, He resides in every soul, and eternally declares, “I am He, I am He”. When we have understood that voice eternally present there, when we have learnt this lesson, the whole universe will have expressed its secret. Nature will have given up her secret to us. Nothing more remains to be known. Thus we find the truth for which all religions search, that all this knowledge of material sciences is but secondary. That is the only true knowledge which makes us one with this Universal God of the Universe. (I, 382)
“We have to realise the Brahma which is housed in our Atma which is unchangeable. There is nothing more to be known. Jeeva, the enjoyer, nature the enjoyed and the propelling force, the God are all facets of Brahma” (Sw. Upa 1-12)
Swamiji has quoted here from Swetaswataropanishad.
This truth was realised by our great rishis through Dhyana Yoga and thus Dhyana became a complete technology for seeking Truth. This again is a great contribution of India to the world at large. Today all over the world Dhyana and Yoga have been accepted as the most important steps in spiritual evolution.
True knowledge is not easy to realise. The seeker of Truth must, first of all, nurture the qualities of ‘shama and dama’. The process by which mind is kept within not allowing it to wander outside is ‘shama’. ‘Dama’ is withholding the world of senses from entering inside. Next comes ‘tithisksha’, not overreacting to pressures outside. It is a very important mental attuning. Hatred, anger, etc. should be totally eliminated from the mind as also any revengeful reaction. And that is ‘ahimsa’. Next comes ‘uparati’, not to think of sense objects at all, followed by ‘shraddha’ or faith in God and in the principles of one’s own religion. Next is ‘samadhana’ keeping the mind in the God through constant attunement. Acute yearning for liberation forms the last step. When all these qualities become integrated in our character true knowledge starts bubbling up from the depths of our being.